9991469 has 2 divisors, whose sum is σ = 9991470. Its totient is φ = 9991468.

The previous prime is 9991463. The next prime is 9991489. The reversal of 9991469 is 9641999.

9991469 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6568969 + 3422500 = 2563^2 + 1850^2 .

It is an emirp because it is prime and its reverse (9641999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9991469 is a prime.

It is a super-2 number, since 2×9991469² = 199658905555922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995734 + 4995735.

It is an arithmetic number, because the mean of its divisors is an integer number (4995735).

Almost surely, 2^9991469 is an apocalyptic number.

It is an amenable number.

9991469 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991469 is an equidigital number, since it uses as much as digits as its factorization.

9991469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 47.

The square root of 9991469 is about 3160.9285028295. The cubic root of 9991469 is about 215.3821866321.

The spelling of 9991469 in words is "nine million, nine hundred ninety-one thousand, four hundred sixty-nine".